thank u 4 reply soon.
but i'm afraid of getting 2n series trans. do u sure our region has available this series, bcoz I found these on only us/europian electronics circuits.
I'm out of electronics market long time ago, now its totaly on demand.
i want to build low batt. (AA x1 or 2 ) led flashlight so i search sub or 2n4401.
c 548/c 828 is available our market. is there any online sub. table of transistor?
Hi
2n5401 is of other type (PNP)-you may get hold of 2n5551 from recovered telephone instruments-dial circuit.
548 can be used provided it meets Vceo parameter is within the limits of your working voltage.
perhaps bc 547 may also be available-- checkout polarity while soldering
hello mamun
I am from bangladesh, of course 2n2222 transistor is available at
dhaka, it will cost 20tk- 30tk each , search at sabium electronics dhaka stadium.good luck.
That circuit is so simple and uses such low voltage and low current that it will work with any little NPN transistor.
Our other topic has nearly the same circuit:
As far i know, 2n2222 is available and cost around 20-30 tk in dhaka, but we get c828 @3/5 tk, bc548 also 5/6 may be, is c828/bc548 is equal to 2n2222/2n4401/2n3904 or others,
and dear aguru(audioguru) do u tell me about the induction coils details, i mean ? material can be use as core.
The core for the voltage stepup circuit I posted is an ordinary ferrite bead that is used for a small inductive choke.
There is another topic on this site in the last couple of days describing it called Joule Thief so search for it here or in Google.